<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>01-JavaScript第一步</title>
</head>
<body>
<script type="text/javascript">
    alert('这是JavaScript程序');  /*弹窗输出*/
    document.write("hello world"); /*网页输出*/
    console.log('hello word'); /*控制台输出*/
</script>
</body>
</html>